[rtkwe]

You say that like it'd be a simple process to accommodate the different thicknesses of battery..

[ProfessorLayton]

I'm not sure what you're trying to say? The replaceable battery is either thicker, or it isn't. There's not much to accommodate.

This is already a thing for some [dedicated] cameras like the Canon EOS series.

[rtkwe]

A thicker battery would need a new back built with a hump or standoffs across the whole back to increase the overall thickness to match the new larger battery thickness...

[ProfessorLayton]

Correct. This used to be done before on flip phones, and is still currently being done for dedicated cameras.

This is a solved problem and not an issue.

[rtkwe]

A modern cell phone is very different from the old flip phones and SLRs/large dedicated camera. Resealing modern phones after upgrades/repairs is one of the harder parts of the whole process with fiddly little sealing glue gaskets to maintain IP ratings.

[ProfessorLayton]

Again, solved problem: https://en.wikipedia.org/wiki/Fairphone_6

[astafrig]

'Solved' by having measurably worse ingress protection than leading smartphones?

[lesostep]

Sony Xperia Z solved in 2013: Water jet protected & Waterproof up to 1 meter in 30 minutes

[spaqin]

I've had a HTC HD2 that had exactly that[1] - an extended battery with a bump. It looked silly, but did its job and in daily usage wasn't that big of a deal, actually provided a resting spot for my index finger.

[1] https://www.phonearena.com/news/Extended-battery-with-kick-s...